diff options
Diffstat (limited to 'lib/CodeGen/SelectionDAG/TargetLowering.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/TargetLowering.cpp | 18 |
1 files changed, 0 insertions, 18 deletions
diff --git a/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/lib/CodeGen/SelectionDAG/TargetLowering.cpp index 27e9b04aaa..7a4d269f79 100644 --- a/lib/CodeGen/SelectionDAG/TargetLowering.cpp +++ b/lib/CodeGen/SelectionDAG/TargetLowering.cpp @@ -580,24 +580,6 @@ bool TargetLowering::SimplifyDemandedBits(SDOperand Op, uint64_t DemandedMask, CountTrailingZeros_64(~KnownZero2)); KnownZero = (1ULL << KnownZeroOut) - 1; KnownOne = 0; - - SDOperand SH = Op.getOperand(0); - // fold (add (shl x, c1), (shl c2, c1)) -> (shl (add x, c2), c1) - if (KnownZero && SH.getOpcode() == ISD::SHL && SH.Val->hasOneUse() && - Op.Val->hasOneUse()) { - if (ConstantSDNode *SA = dyn_cast<ConstantSDNode>(SH.getOperand(1))) { - MVT::ValueType VT = Op.getValueType(); - unsigned ShiftAmt = SA->getValue(); - uint64_t AddAmt = AA->getValue(); - uint64_t AddShr = AddAmt >> ShiftAmt; - if (AddAmt == (AddShr << ShiftAmt)) { - SDOperand ADD = TLO.DAG.getNode(ISD::ADD, VT, SH.getOperand(0), - TLO.DAG.getConstant(AddShr, VT)); - SDOperand SHL = TLO.DAG.getNode(ISD::SHL, VT, ADD,SH.getOperand(1)); - return TLO.CombineTo(Op, SHL); - } - } - } } break; case ISD::SUB: |